Communication system



Oct. 26, 1937. o. MYERS COMMUNICATION SYSTEM Filed Sept. 1'7, 1931 15 Sheets-Sheet 1 o. Mrt-Rs 6.96. M A

A 7' TORNEV Oct. 26, 1937.Y o. MYERS 12,096,819

f coMMuNlcA'rIoNsYs'rEM V Filed sept. 17, 1951 15 sheets-sheet 2 /NVENTOR o. MYERS B @6.64%

Oct. 26, 1937. 0, MYERS 2,096,819

COMMUNICATION SYSTEM Filed Sept. '17, 1931 'l SheeAts-Shqet 3 /NVENTOR 0. MYERS By @5M y, ArToR/ver sTocK KEY SET v LOlt. 26, 1937.

ma! OOS) o. MYERS Y COMMUNICATION SYSTEI Y Filed Sept.. '17, 1931 15 Sheets-Sheet 4 IN1/Enron 0. MYERS @y @62m 'ATroR/VEV Oct. 26, 1937. o. MYI-:ns 2,096,819

COMMUNICATION SYSTEM Filed sept. 1:7, 1931 15 sheets-sheet 5 .//vl/E/vrok 0. MYERS "mem ATToRA/jy Oct. 26,v 1937.` o. MYERS COMMUNICATION SYSTEM 15 Sheets-Sheet '7 Filed Sept. -17, 1931 f lllllllll In n /NVENTOR o. MYERS BV @w N ...um

ATTORNEY Oct. 26, 1937. o. MYI-:ns

COMMUNICATION SYSTEM Filed Sept, 17, 1951 15- SheetS-Sheet 9 NVENTOR By o.- Mya-@s u. .um

ATTORNEY Oct. 26, 1937. o, MYERS 2,096,819

COMMUNICATION lxS'vlIM Filed sept. 17, 1931 15 sheets-sheet 1o /NVE/vmn 0. MY E RS By @aww ATTORNEY ocnze, 1937. ,Q MYERS 2,096,819

COMMUNICATION SYSTEM Filed Sepi. 17, 1931 15 Sheets-Sheet 11 UNITS KEY REGISTER /NVENTo/P 0. MYERS By @QM A TTORNEI Oct'. 26, 1937. o. MYERS 21,096,819

COMMUNICATION4 SYSTEM Filed sept. 17. 1931 15 sheets-Sheet 12 MARG/NAL /NVENTOR o. MYERS ATTORNEY COMMUNICATION .SYSTEM Filed Sept, 117, 1931 15 Sheets-Sheet 1 3 FIG, I3.

.lA/ VENTOR vO. MYERS B* @aw ATTOREV Oct, 26, 1937. o.l MYERS 2,096,819

COMMUNICATION SYSTEM Filed Sept. 1'7, 1.931 15 Sheets-Sheet 14 REGISTER s K g5 /NvfNroR t -Byo. MYERS Arron/vir Oct; 26, 1937. o. MYERS 2,096,819

COMMUN IvCATIH SYSTEM Filed Sept. 17, 1931 15 Sheets-Sheet 15 /NVENTOR 0. MYERS By A TTORNEV Patented Oct. 26, 1937 UNITED ,STATES coMMUNrcamoN SYSTEM Oscar Myers, Brooklyn, N. Y., assigner to Bell Telephone Laboratories, Incorporated, New York, N. Y., a corporation of New York Application september i7, 1931, seria; No. 563,275

s Claims. (ci. 177-353) This invention relates to a communication system and more particularly to an automatic information system adapted to be used for the transmission of intelligence.

Broadly considered, the object of the invention is to obtain an eiiicient, automatic information service whereby those who subscribe to the service may, upon the proper manipulating at the originating station of a calling device, obtain an information response at said station wherein the character of said response is controlled by an impulse code assigned thereto.

More particularly, the present invention comprises a telephone system in which an automatic subscriber may, by dialing a suitable impulse code into an automatic central agency, receive back in the telephone receiver a telegiaphophonic response controlled by the code that was dialed.

As an illustration of the manner in which the invention may be applied, one embodiment of it is herein completely described with reference to a specific kind of information system; that is, to a stock quot-ation system in which the sale price of a particular stock is telegraphophonically transmitted by the central automatic agency to the calling subscriber in response to the dialing of an impulse code assigned to that stock.

It is understood, however, that the invention is not limited to a stock quotation system nor to a telephone system as it is apparent from the principle of the disclosure herein contained that the breadth of its application is limited only by the number of possible impulse codes and the character of the information which may be associated with each code. It is also apparent from the disclosure herein contained that the invention may be applied to any electrical network operating on an impulse registration basis wherein the registration of a series of impulses may be translated into any form of information which can be transmitted to the originating station either telegraphophonically or by any other suitable means.

In accordance with the invention, therefore, one specic embodiment of which is disclosed herein by way of illustration, this is accomplished in the following improved manner:

The automatic information system herein contemplated comprises an automatic telephone line, a register sender, a telegraphophone and a de- 'three digits, removes his receiver from the hook coder. The sender is used for the registration of the impulses transmitted from th'e subscriber's dial and may be of the type used in automatic telephone switching systems such as, for example, the type shown in Patent No. 1,616,182 granted 5 February 1, 1927 to 0. C. From. The decoder, comprising a group of relays and cooperating circuits, is connected to the sender at the proper time and receives and records the registration dialed into the sender. 'This record is then trans- 10 lated into the operation of a relay individual to the impulse code, there being a relay in the decoder for each impulse code available to the subscriber. The contacts of the code relay control the various electrical circuits which formthe l5 electrical equivalent of the information to be transmitted. The decoder contemplatedin this invention is similar to the one shown in the copending application of R. Raymond and W. J. Scully, Serial No.- 543,510, led June 11, 1931, 20 Patent No. 1,862,549 dated June 14, 1932, and is modiied only with respect to such details as are necessary to disclose and carry out the principles of this invention.

In general the system works in the following wayz A subscriber who has access to the automatic stock quotation information ser-vice, upon Wanting to obtain, let us say, the latest stock quotation sale of a`stock which is listed by a code of and immediately thereafter a sender is attached to the line. Dial tone is then transmitted thereover to indicate to the subscriber that he may proceed to dial. The subscriber then dials the three digits of the stock code and the dial impulses are registered on the three separate registers in the sender. When the impulses of the third dig-lt are dialed the sender is automatically connected to an idle decoder through the medium of a connector and the impulse registration in the sender is transmitted and locked on a group of register relays in the decoder. The impulse registration in the decoder is thereafter translated to operate the code relay in the decoder corresponding to the impulse code.

Some of the contacts of the code relay are controlled through a series of keys of a key-set which may be set at a keyboard at the stock post in the stock exchange where the trading in the stock takes place, or any other suitable place; 50

there being, according to one embodiment of the invention, one key-set for each stock. Through the contacts of these keys are controlled storing registers in the decoder which operate when the keys are depressed and the corresponding code relay operated. The operation of one key in each of,the hundreds, tens, units and fractions series of 'a stock key-set closes circuits through the contacts of the said operated code relay to the storing registers in the decoder. The storing registers, in turnrcause the operation of register or memory" relays in the -sender and thereby retain a record of the number depressed on the keys. As soon as the memory relays in the sender are operated and locked, the decoder disconnects and is thereby made available for use with other send- Y ers. The operation of the memory" relays in the sender closes circuits whichserve to connect a telegraphophone to the subscribers line by way -sale price of the stock -When the subscriber restores,

ofthe sender'whereby the electrical information locked in the memory relayzhcaugs :1l-:cmg:- graphophn oneto ronounceto es sc r e D whose code he dialed.

tno sender is aisconnected from the calling line, the teiegraphoone from the sender and both return to normal.

There are other new and novel features which form a part of this invention as will be seen from the following description and appended claims. A clearer conception of the scope and purpose of the invention can be obtained from a consideration" of the following description taken in connection. with the attached drawings in which: Fig. l )shows the subscriber or stock-brokers line switch circuit;

Figa-2, 5 and 6, taken together, comprise the register sender; o

Fig. 3 shows lthe telegraphophone machine' and sender switching circuit; Fig. 4 shows a stock post stock key-set;

Figs. 'l and 8, taken together, comprise the conl nector circuit; Y

Figs. 9 to l5, inclusive, is the decoder or-translator circuit; l

Fig. l-A is a diagrammatic representation of the present embodiment of the invention;

Fig. 16-B is a ditic representation of another arrangement of the invention; and y Fig. 1'7 shows how Figs. l to l5, inclusive, are to be arranged with respect to each Iother in order to disclose the invention completely.

It is assumed for the purpose of illustration only that the present embodiment of the invention is adapted exclusively to an automatic stock quotation system although, as already stated, it will be evident from the description following hereinafter that the invention is not limited to y such a system but may be adaptedfor transmitting to a calling -point any kind of information which can be represented by a code 0f impulses.

The stock-broker or subscriber, in order to ob tain the quotation of a desired stock, removes the telephone receiver from the,A hook. 'A circuit is then completed from ground on the top back contacts of relay |03, over the line loop, bottom inner back contacts o f relay |03, winding of relay |00 to battery. Relay |00 operates and closes an obvious circuit for relay |02. Relay |02 operates and closes its bottom outer contacts and 2 with contact 3 in the order indicated. With the closure of contacts and 3 a differential circuit is closed from ground through the top winding of relay H0, contacts and 3, middle winding of relay ||0 to battery. 'I'hese two windings of relay IIS, being differential with respect to each other,` will not lcauselthe relay to .operate-in tbe vlabove traced circuit. -With the closure of conswitch`|0|,`bottom inner contacts of relay |02to 1Q groimd on the bottom baok contacts oi relay m,

if relay `||0 has not operated in the meanwhile as explained later. Relay |00 operates and a circuit is closed for magnet |04 of sender selector switch |0| extending from battery through the winding ls of-` magnet |04, contacts of relay |00, bottom inner contacts of relay |02-to ground on the bottoniback contacts of relay ||0. Magnet |04 operates, 1' breaks its interrupter contacts and thereby causes the release of relayl00. The release 'of relay |00 causes magnet |04 tor'eleaseand, on the releasing stroke of the armatureof said magnet, brushes |00, |01, |00 and |00 are advanced in the well known manner to the next terminals in each of the respective associated arcs. The release of 20 magnet |04 and the consequent reclosure of its interrupter contacts, reestablishes the circuit of relay |00. Relay |00 operates and the previously traced circuit of magnet |04 is once more reestab lishedcausing said magnet to operate and ad- 30 Vance said wipers to the next succeeding terminals as. already described. The operations of relay I00 and switch magnet |04 continue until an idle sender is found.

Now an idle sender is characterized by the 35 presence of battery potential through resistance 200, bottom make contactspf Jack 20|, top back contacts of relay 20| to conductor ||3 and the above operations take place supposing the sender selector switch |0| to be standing on and ad- 40 vancing over terminals of the arc associated with 'brush |00 from each of which said battery -potenti'al has been removed by the busy condltion of the associated sender as more fully explained hereinafter. have advanced to a set of terminals having said battery `potential connected to conductor ||3 a circuit is closed from battery, resistance 200. top back contacts of relay 20|, bottom make contacts of `iaclr 20|, top inner contacts of relay 50 20|, conductor II3, brush |03, lower winding of relay 0, to bottom contacts of relay |02, ground through the top winding of relay`||0 and, in parallel therewith, to battery through themiddie winding of relay H0. Relay ||6 operates 55 very quickly, opens at its bottom back contacts the circuits of relay |05 andswitch magnet |04 causing them both to release and locks momentarily in a circuit from ground'on its bottom front contacts, lower winding oi relay ||0 t`o o0 battery on conductor ||3. With the operation of relay ||0 the circuit of relay |02 is opened, causing this relay, after a brief interval, to release.

A,With relay |02 released a circuit is closed from,

ground on the top front contacts of relay H0, 65

back contacts of relay |02, top winding of relay |03 to battery. Relay |03 operates, opens the circuit of relay |00 which releases, locks overa` oirouit from battery tiirough'its bottom winding 70 When the switch brushes 45 v I the subscribers line is extended into the sender lay 20| removes the batteryv potential from conductor||3 causing the release of relay I 6.

It 1s evident that if, atthe 'time' the subscriber initiates the call, the sender selector switch |0| is connected with an -idle sender, relay H6 will operate immediately, contact 2 on relay "|02 is closed and no circuit would then be available to operate switch magnet |04, thereby causing it to remain, as it should, on the terminals of the idle sender to which it is connected.

When relay, |03 operates as. already described,

over a circuit path which may be traced from battery through the. top winding of relay 201, left bottom winding of repeating coil 24|, bottom inner contacts of jack 25|, bottom outer contacts of relay 20|, conductor brush |01, conductor 5, bottom inner front contacts of relay |03, the line loop, top front contactsof relay |03, c onductor ||4, brush |06, conductor ||0, top outer contacts of relay 20|, top contacts of jack 25|, left upper winding of repeating coil 20| to ground. Relay 201 operates and closes an obvious circuit for relay 2|| which also operates. Relay 2|| operates slow-release relay 222 over :a circuit from ground on its bottom contacts and relay 222, in turn, causes the operation of slow-release relay 23| in a circuit extending from ground on the bottom contacts of relay 222, bottom middle back contacts of relay 230, winding of relay 23| to battery. Over its top contacts relay 222 closes a circuit to the winding of relay 205 by way of conductor 239thereby causing this relay to operate also. Relay 205 causes the operation of slow-release relay 232 in a circuit from ground on the bottom contacts of relay 205, contacts of relay 23|, winding of relay 232 to battery. Relay 232 causes the operation of relay 230 which locks over a. circuit through its bottom inner contacts to ground on the bottom contacts of relay 2 22. The operation of relay 230 opens the circuit of 'relay 23| and the consequent release of this relay, after an interval, releases relay 232. When relay 232 releases, a path is closed from battery through the winding of relay 226, bottom outer contacts of relay 239 to ground on the normally made contacts of relay 232. With the operation of relay 226 an operating circuit is closed from battery through the winding of relay 2| 8, back contacts of relay 2|4, to ground on the top outer contacts of relay 226. Another circuit is also closed from battery through the winding of relay 206, bottom contacts of relay 2|0, conductor 252 to ground on the bottom outer contacts of relay 226. Relay 206 operates and 'connects ground o ver its top middle front contacts, lower winding of relay 201 and condenser, secondary vwinding of tone coil 253 to ground. Due to this circuit a tone is induced through the upper winding of relay 201 and transmitted over its circuit path, above described, to the subscribers telephone receiver, indicating to him that the central ofice equipment is ready and that he may proceed to dial the code Aof the stock whose sale price he desires to ascertain.

When the subscriber rotates the dial, which is the same as the well known subscribers dial used in automatic telephony and then releases it, the dial returns to normal and, in doing so, creates a series of open impulses over the line corresponding in number to the rst numerical digit of the desired code.

In order to completely understandthe operation of the sender circuit incident to the response of the dial impulses, the description of the circuit' release. Relay 2|| likewise releases and a circuit is established for slow-release relay 2|4 from Y ground on the top outer contacts or relay 226,

' top inner back contacts of relay 2|,|, winding of relay 2|4 to battery. Relay 2|4 operates and, over its top contacts connects non-inductive resistance 249 in parallel with the top winding of relay 201 so that relay 201, in-responding`to dial impulses, as explained hereinafter, will be made more sensitive than it otherwise would be in the circuit including the two windings of repeating coil 24|. With the operation of relay 2| 4, relay 2|0 releases. A circuit is also established from ground through the back contacts of relay 201, top front contacts of relay 205, top inner contacts of relay 226, topinner back contacts of relays 224, 220, 2|6, 2|3 and 209, winding of relay 208; conductor 254, to battery. .Relay 208 operates and establishes a locking path for itself through the winding of relay 200, contacts of relay 200, top outer contacts of relay 2|3, conductor 255, normal contacts of relay 2|8 to ground on the top outer contacts of relay226. Relay 209, however, does not operate at this time due to the presence of the operating ground for relay 208 on one side of its windingand the ground above traced on its other side. When the impulse terminates by the reclosure of the line loop, relay 201 reoperates, the operating ground for relay 208 is removed and hence also from one side of the winding of relay 2539, and relay 209 operates in the locking circuit of relay 238. Both relays are now locked to an aforetraced ground 4on the top outer contacts of relay 226. When relay 203 operates a circuit is closed from ground on its bottom contacts, conductor 234, tcp outer frontcontacts of relay 206, bottom winding 'of relay 22| tobattery. Relay 22| operates but otherwise performs no function at this time.

When relay 201reoperates, relay 2I| may or may not operate depending` upon the rapidity with which succeeding impulses are received. Since, however, relays 2|4 and 222 are both slowto-release, neither of them will release, the former releasing only after a train of impulses has been received at which time the relay 2|| will remain operated for a comparatively longer period, while The second impulse releases relay 201 again and a path is now closed from ground through the back contacts of relay 201, topv front contacts of relay 205, top' inner contacts of relay 226, top inner back contacts of relays 224', 220, 2|6 and 2| 3, top front contacts of relay 209, winding of relay 2|2, conductor 254, to battery. Relay 2|2 operates and closes a locking circuit for itself through the winding of relay 2|3, contacts of relay 2|2,

top outer contacts of relay 220, to ground on conductor 255. Relay 2|3, however, is short-circuited by the presenceof the operating ground for relay 2| 2 on one side of its winding and' the aforetraced locking ground on the other side so that this relay does not operate at this time. When the open period of the impulse is terminated, relay 201 operates, the aforesaid operating vground forrelay 2| 2 is removed from the winding of relay 213 andthis relay .now operates in the locking circuit of relay 212, above traced. Relays 212 and 213 are now locked. With the operation of relay 213 the locking circuit of relays s 203'and 209 is opened at the top outer contacts of -relay 213 and relays 200, 200 and 221 release. Relay 213 closes a circuit from ground on its bottom contacts. conductor 242, bottom middle contactsof relay-,206, bottom winding of relay 220 to l battery. Relay 229 operates but otherwise PCP forms no useful function.

When the third impulse is being transmitted, relay 201 releases and a path is closed from ground on the back contacts of relay 201, top

l contacts of' relay 205, top inner contacts of relay 226, top inner back contacts of relays 224l 220 and l 216, top inner front contacts of relay 213, winding of relay 215, conductor 254 to battery. Relay 215 operates, establishes a locking path through the `winding of relay 216, contacts of relay 215, top outer back contacts of relay 220, to ground on conductor 255. Relay 216 does not operate in this circuit at this time due to the presence of operating ground for relay 215 on one side of its winding and the above traced locking ground on the other. When the open period of the impulse is over and relay 201 reoperates, said operating ground is removed and relay 216 operates' in the locking. circuit abover described. Relays 215 and 90 216 are now locked in addition to relays 213 and 212. Relay 216, over its inner bottom contacts, closes the previously traced circuit of relay 221 which now reoperates but again performs no use ful function.

On the fourth impulse relay 201 releases and a path is closed from ground on the back contacts of relay 201, top front contacts of relay 205, top inner contacts of relay 226, top inner back contacts of relays 224 and 220, top front contacts of relay 216, Winding of relay 219, conductor 254 to battery. Relay 219 operates and establishes a locking path for itself through the winding of relay 220, contacts of relay 219, top outer back contacts of relay 224 to ground on conductor 255. Relay 220 is short-circuited by the operating ground for relay 219 and does not, therefore,loperate at this time. When the impulse is over, relay 201 reoperates, said short-circuiting ground is removed and relay 220 operates in the'locking circuit of relay220 above traced. With the operation of relay 220 and the consequent opening of its top outer back contacts, the locking circuit of relays 212, 213, 215 and 216 is opened and these relays release. Relays 22| and 229 likewise release. Relay 220 closes a circuit from ground on its bottom contacts, conductor 243, bottom inner contacts of relay 205, winding of relay 225 to battery. Relay 225v operates but performs no useful function.

On the fifth impulse, the release of relay 201 closes a circuit path from ground on the back contacts of relay 201, top front contacts of relay 205, top inner contacts of relay 226, top inner back contacts of relay 224, top inner front contacts of relay 220, winding of relay 223, conductor 254 to battery.` Relay 223 operates and establishes a locking path for itself through the winding 'of relay 224 and contacts of relay 223, top 70 outer contacts of relay 213, to ground on conductor 255. Relay 224 does not operate in this path at this time due to the fact that it is shortcircuited by the operating ground for relay 223. When the impulse is terminated and relay 201 `reoperates, said short-circuiting ground is xemoved and relay 224 operates in the above traced locking circuit.

When relay 224 operates, the locking circuit of relays 219 and 220 is opened at its top outer back contacts thereby causing these relays to release. Relay 225 likewise releases. A path is also closed. from ground on conductor 255, top outer front contacts of relay 224, top contactsy of relay 220, winding of relay 221 to battery. Relay 221 operates and establishes a locking circuit for itself from ground on` conductor 255, contacts of relay 221, winding of relay 220 to battery through the winding of relay 221. Due to the fact that the operating ground forrelay 221 is also presenton one side of the winding of relay 220 through its own top contacts, relay 220 does not operate at this time. Relay 224 also closes a circuit from ground on its bottom contacts, bottom outer back contacts of relay 220, bottom outer back contacts of relay 206, bottom winding of relay 233, to bat- `tery. Relay 233 operates but performs no useful function at this time. l

operates as before.

On the seventh impulse, a circuit path is closed from ground on the back contacts of relay 201, top front contacts of relay 205, top middle contacts of relay 226, top inner front contacts of relay 224, top inner back -contacts of relays 216 and 213, top front contactsof relay 200, winding of relay 212, conductor 254 to battery. Relays 212 and 213 now operate in the manner described for the second impulse and relay 229 also operates.

With the operation of relay 213, relays 200, 205 and 221 release. Relays 223 and 224 likewise release with the result that the short-circuiting ground to the winding of relay 223 is removed at the top outer front contacts of relay 224 causing relay 228 to operate in the locking circuit of relay 221 above described. VRelay 233 momentarily releases but again reoperates over a circuit 'now completed from ground on the bottom back contacts of relay 224, bottom outer front contacts of relay 220 to conductor 244.

On the eighth impulse a previously traced circuit is closed for relay 215 and, at the termination of the impulse, relay 216 operates and locks in the locking circuit of relay 215. Relays 221 and 229 again operate over the previously traced circuits.

On the ninth impulse relay 219 operates and at the termination thereof relay 220 operates and locks in the locking circuit of relay 219 and relay 225 again operates. The operation of relay 220 releases relays 212, 213, 215 and 216 as already described and relays 229 and 221 also release.

On the tenth or zero impulse, relays 223 and 224 operate and lock as described for the fifth impulse and relay 224 now Vcloses a circuit from ground on its bottom front contacts, bottom inner front contacts of relay 220, conductor 245, top inner contacts of relay 206, bottomv winding of relay 211, to battery. Relay 211 operates but performs no useful function. With the operation of relay 224 relay 233 releases.

The following table shows, in recapitulated form, the relation between the number of impulses and the number of pairs of counting repulses.

Number of impulses Operated relays Each digit of the stock code comprises a group of impulses from a single impulse to ten impulses. When, therefore, the dial has returned to normal after the transmission of the impulses of the rst digit of the code, the time interval necessary for the subscriber to rotate the dial for transmitting the impulses of the second digit of the code is utilized to register in the sender the registration of the rst digit. It will be assumed for the pur- 2 pose of illustration that the code in question is representedv by the designation 492. When the dial has returned to normal after transmitting four impulses, relay 201 is reopcrated over the line loop and remains up during the above mentioned interval, and relay 2|| reoperates. Relay 2|4 now releases and causes the reoperation of relay 2|8 over an aforetraced circuit; relay 2|8 locking over the top inner contacts of relay 2|| to ground on the top outer contacts of relay 226.

During the operated condition of relays 2|9 and 220, relay 225 was operated as already described and, with the receipt of further impulses in the series of the iirst digit, would have released. But with the termination of the series of impulses of the erst digit 'after the fourth impulse is received and the consequent operation of relay 2I8, a locking circuitis established for relay 225 through its top winding and contacts, conductor 256, winding of relay 2|0, conductor 251,

top outer back contacts of relays 500 and 50|, conductor 258, top contacts of relay 2|8 to ground on the top outer contacts of relay 226.

Relay 2|0 operates in the locking circuit above traced and is itself locked over a circuit through 50 its top contacts, conductor 252. to ground on the bottom outer contacts of relay 226. The operation of relay 2|0 causes the release of relay 206 thereby opening the operating path to each of the first digit register relays, namely, relays 2|1, 22|, 225, 229 and 233. A circuit is also closed from ground on conductor 252, top contacts of relay 2I0, conductor 502, bottom contacts of relay 5&3, winding of relay'500 to battery. Relay 520 operates and prepares paths to the operating windings of the second digit register relays, namely. 504, 505, 506. 501 and 508. When the subscriber manipulates his dial for transmitting the nine impulses of the second digit, the line relay 201 follows the impulses, relay 2|4 operates and 65 relay 2|8 releases, all as previously described.

Relays 505 and 508 operate and, at thetermination of the nine impulses of the digit 9, the release of relay 2|4 and the consequent operation of relay 2|8 establishes a locking circuit for relays 506 and 508 from battery through the top windings and top contacts of relays 506 and 508, conductor 528, winding of relay 503, top outer contacts of relay conductor 258, top outer contacts of relay 2| 8 to ground on the top outer contacts of relay 226. Relay 503 operates in said locking circuit and locks in series with relays 506 and'508 through the top contacts of relay 503 to an aforetraced ground on conductor 252.

yWhile the operation of any of the relays 504, 505, 506, 501 and 508 has notbeen described, it will be easily seen that they function in the same way as the corresponding relays of the first register, that is, relays 2|1, 22|, 225, 229 and 233 in that they each momentarily operate on the reception of the impulse and release on the reception of the succeeding impulse while the appropriate register relay will lock through the winding of relay 503 to register the last impulse received prior to the operation of relay 2| 8.

The operation of relay 503 releases relay500 thereby opening the path to each of the windings of the second digit register relays. When relay 503 operates, a circuit is also closed from battery through the winding of relay 50|, top back contacts of relay 5|4, top contacts of relay 503 to an aforetraced ground in conductor 252. Relay 50| operates and prepares paths to the operatingwindings of the third digit register relays, that is. relays 509, 5|0, 5| 5|2 and 5|3.

The subscriber now manipulates his dial for digit 2 and thereby transmits, in the manner described, a series of two impulses. Wheny the impulses are al1 transmitted, and relay 2|4 released and relay 2|8 operated, a locking circuit is closed for relay 5|2 through its top winding and top contacts, conductor 529, Winding of relay 5|4, conductor 258, top contacts of relay 2|8 to ground on the top contacts of relay 226. Relay 5|4 operates in this locking circuit and, with the closure of its top contacts, provides another locking circuit for itself and the register relay 5| 2 to ground on conductor 252. The operation of relay 5| 4 opens the circuit of relay 50|, which relay releases and thereby opens the path to each of the relays of the third register.

' The code representing the stock has been limited,'for the purpose of describing thepresent embodiment of the invention, to a three digit code. Consequently after the reception of the impulses comprising the third digit of the code no more impulses will be transmittedY and relay 2| 8 will remain operated. It is understood, however, that the invention is not limited to any specified number of digits and the code may be restricted or expanded to eliminate or include as many digits as will be found necessary by the number of `different items of information to be transmitted to a calling line. Under such circumstances the sender can be easily modied to eliminate unnecessary registers or include others for the registration of further digits, as the case may be, and their operation will be identical with thatv of lthe registers described above.

When relay 20| operated, as already described, a circuit was closed from ground on the bottom inner contacts of this relay, conductor 264,

Winding vof relay 541, resistance 525 to battery.

Relay 541 operates in this circuit and closes a.

circuit from ground on the interrupter contacts of switch magnet 524, bottom front contacts of relay 541, winding of slow-release relay 5|8 to,... battery. Relay 5|8 operates and, in turn, causesvv Relay 

